问题
选择题
In winter, people usually keep flowers in their houses to ______ them against the cold. [ ]
A. produce
B. provide
C. protect
D. prevent
答案
答案：C
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In winter, people usually keep flowers in their houses to ______ them against the cold. [ ]
A. produce
B. provide
C. protect
D. prevent
答案：C
以下提供若干个案例，每个案例下设若干个考题。请根据各考题题干所提供的信息，在每题下面的A、B、C、D、E五个备选答案中选择一个最佳答案。
| 男性患者，25岁，高处坠落，双侧脚跟受伤。双跟骨变形，考虑跟骨骨折，需做X线检查，以了解骨折情况。 |
跟骨轴位摄影，中心线应向头侧倾斜角度应是
A．10°
B．20°
C．30°
D．45°
E．55°